One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,15)(12,14)(13,16)(18,23)(24,29)(25,31)(27,32) involution — undirected(2,6)(7,8)(11,16)(13,15)(17,18,21,23)(19,24,22,29)(20,27,28,32)(25,30,31,26)(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(17,19,21,22)(18,24,23,29)(20,26,28,30)(25,32,31,27)(1,4,5,3)(2,8,6,7)(10,14)(13,15)(17,20)(18,25)(19,26)(21,28)(22,30)(23,31)(24,32)(27,29)(2,6)(7,8)(20,28)(25,31)(26,30)(27,32) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.